I found this on another posting at

http://www.mrexcel.com/archive/Formulas/14269.html

Distinct values within a column
Posted by Andrew Miller on January 09, 2002 1:43 PM
Is there any way to calculate how many distinct values appear in
column. My column is much larger with many more values, but fo
instance say I have a column that has 3 cells in it. The value in th
first cell is DO12, the second is DO12, and the third is DO13. I onl
have two distinct values (DO12 and DO13) in this column. Is there an
way to automatically return a value that tells me the number o
distinct values? Thanks.

Distinct values within a column
Posted by Mark W. on January 09, 2002 2:09 PM
Is your list sorted? If so, use...

{=COUNTA(A1:A3)-SUM((A1:A3=OFFSET(A1:A3,1,))+0)}

Note: This is an array formula which must be
entered using the Control+Shift+Enter key
combination. The outermost braces, {}, are not
entered by you -- they're supplied by Excel in
recognition of a properly entered array formula.


Or more simply...
Posted by Mark W. on January 09, 2002 2:15 PM
{=SUM((A1:A3<OFFSET(A1:A3,1,))+0)}

-----------------------------------------------

And it works. For more information on Array formulae, see the Exce
Help

spike

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